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參數(shù)資料
| 型號(hào)： | HSC-INTERFACEBOARD |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | 1.75 MSPS, 4 mW 10-Bit/12-Bit Parallel ADCs |
| 中文描述： | 1.75 MSPS的，4 10-Bit/12-Bit并行模數(shù)轉(zhuǎn)換器毫瓦 |
| 文件頁數(shù)： | 12/16頁 |
| 文件大?。?/td> | 197K |
| 代理商： | HSC-INTERFACEBOARD |
REV. A
AD7470/AD7472
–
12
–
Mode 1
Figure 14 shows the AD7472 conversion sequence in Mode 1
using a throughput rate of 500 kSPS and a clock frequency of
26 MHz. At 5 V supply the current consumption for the part
when converting is 2 mA and the quiescent current is 650
μ
A.
The conversion time of 531.66 ns contributes 2.658 mW to the
overall power dissipation in the following way:
(531.66
ns
/2
μ
s
)
×
(5
×
2
mA
) = 2.658
mW
The contribution to the total power dissipated by the remaining
1.468
μ
s of the cycle is 2.38 mW.
(1.468
μ
s
/2
μ
s
)
×
(5
×
650
μ
A
) = 2.38
mW
Thus the power dissipated during each cycle is:
2.658
mW
+ 2.38
mW
= 5.038
mW
CONVST
BUSY
531.66ns
1.468 s
2 s
t
CONVERT
t
QUIESCENT
Figure 14. Mode 1 Power Dissipation
Mode 2
Figure 15 shows the AD7472 conversion sequence in Mode 2
using a throughput rate of 500 kSPS and a clock frequency of
26 MHz. At 5 V supply the current consumption for the part
when converting is 2 mA, while the sleep current is 1
μ
A max.
The power dissipated during this power-down is negligible and
is thus not worth considering in the total power figure. During
the wake-up phase, the AD7472 will draw 650
μ
A. Overall
power dissipated is:
(
531 66
2
5
2
1
2
5
650
4 283
.
.
/
/
ns
s
mA
s
s
A
mW
μ
μ
μ
μ
)
×
×
(
)
+
(
)
×
×
(
)
=
CONVST
BUSY
t
WAKEUP
531.66ns
1.468 s
2 s
1 s
t
CONVERT
t
QUIESCENT
Figure 15. Mode 2 Power Dissipation
Figure 16 and Figure 17 show a typical graphical representation
of Power vs. Throughput for the AD7472 when in (a) Mode 1
@ 5 V and 3 V and Mode 2 @ 5 V and 3 V.
THROUGHPUT
–
kHz
8
4
0
50
300
P
–
1500
1300
1100
1000
800
600
7
3
6
2
5
1
+5V
+3V
Figure 16. Power vs. Throughput (Mode 1 @ 5 V and 3 V)
THROUGHPUT
–
kHz
4
0
50 100
P
–
750
700
650
600
300
200
7
3
6
2
5
1
150
350
250
400 450 500 550
+5V
+3V
Figure 17. Power vs. Throughput (Mode 2 @ 5 V and 3 V)
CODE
1
0
–
1
0
I
–
4096
–
0.8
3584
3072
2560
2048
1536
1024
512
–
0.6
–
0.4
–
0.2
0.2
0.4
0.6
0.8
Figure 18. Typical INL for 2.75 V @ +25
°
C
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